This is a little off topic, but I know this list has people in it who can answer this easily. We are a small ISP and I'm trying to figure out how to keep my customers from getting so much ARP traffic. Here's a very dumbed-down diagram of how the network is set up: ,------------. | 4 T1 lines | `------------' | ,--------------. | Cisco Router | `--------------' | ,-----------------. ,------------------. ,-------------. | Ethernet Switch |---| Web/Email Server |---| DHCP Server | `-----------------' `------------------' `-------------' | (( Wireless Network )) | ,---------------. | Customer's PC | `---------------' Right now, customers default gateway is set to the Cisco Router. I'm guessing I need to insert another router in the mix and customers should be using it. New diagram: ,------------. | 4 T1 lines | `------------' | ,--------------. | Cisco Router | `--------------' | ,-----------------. ,------------------. | Ethernet Switch |---| Web/Email Server | `-----------------' `------------------' | ,--------------. | Linux Router | `--------------' | ,-----------------. ,-------------. | Ethernet Switch |---| DHCP Server | `-----------------' `-------------' | (( Wireless Network )) | ,---------------. | Customer's PC | `---------------' Am I right? If so, what do I need to do to get this going right? Thanks in advance, Travis